Question

如何在AbstractHasData的实现中添加onclick事件。我想我必须添加CellPreviewEvent，但我有困难这样做。如果我的方法正确以及如何添加CellPreviewEvent，请告诉我。

public class TLayout extends AbstractHasData<Summary> {

private LayoutPanel main;
private ScrollPanel scroller;
private FlowPanel contents;
private ListDataProvider<Summary> dataProvider = new ListDataProvider<Summary>();
public TLayout(int pageSize,
        ListDataProvider<Summary> dataProvider) {

    super(new LayoutPanel(), pageSize, dataProvider.getKeyProvider());
    this.dataProvider = dataProvider;
    main = (LayoutPanel) getWidget();

    main.addStyleName("TLayout");

    contents = new FlowPanel();
    scroller = new ScrollPanel(contents);

    main.add( scroller );

    scroller.addStyleName("scroller" );
    contents.addStyleName("contents");

    main.setSize("100%", "100%");

    main.setWidgetLeftRight(scroller, 0, Unit.PCT, 0, Unit.PCT);
    main.setWidgetTopBottom(scroller, 0, Unit.PCT, 0, Unit.PCT);


}
@Override
protected void renderRowValues(SafeHtmlBuilder sb,
        List<Summary > values, int start,
        SelectionModel<? super Summary > selectionModel)
        throws UnsupportedOperationException {
    // TODO Auto-generated method stub

    Log.debug( "TLayout.renderRowValues() ENTER" );

    for (Summary summary : values) {
        sb.appendHtmlConstant(createCard( summary ));
  }
}

private String createCard(Summary summary ) {

    StringBuilder builder= new StringBuilder();

    builder.append("<div class='summary'>");
    ....
    .....
    return builder.toString();
}

Answer 1

最简单的方法是使用SelectionModel。您可以将SelectionModel添加到抽象数据库中，该数据将处理您的摘要类的选择。

private final SingleSelectionModel<Summary> summarySelectionModel = new SingleSelectionModel<Summary>() {
    {
        addSelectionChangeHandler(new SelectionChangeEvent.Handler() {

            @Override
            public void onSelectionChange(SelectionChangeEvent event) {
                Summary summary = getSelectedObject();
                if (summary != null) {
                    // do something
                }
            }
        });
    }
};

tlLayout.addSelectionModel(summarySelectionModel);

如何在gwt中的AbstractHasData实现中添加onclick事件

1 个答案: